fix: align esX browserslist expression to SWC #1287
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Pull Request Overview
This PR aligns the ECMAScript version to browserslist mappings with SWC's implementation by updating browser version requirements across different ES versions. The changes remove .0.0 version suffixes, update browser version requirements to match SWC's data, and refactor es6 and es2023 to reference their equivalent ES versions using getters.
Key changes:
- Updated browser version mappings for es5 through es2022 to match SWC's compatibility data
- Simplified version format by removing
.0.0suffixes (e.g.,51.0.0→51) - Added getter properties for
es6(points toes2015) andes2023(points toes2022)
Reviewed Changes
Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.
Show a summary per file
| File | Description |
|---|---|
| packages/core/src/utils/syntax.ts | Updated ESX_TO_BROWSERSLIST mappings with SWC-aligned versions, simplified version format, and added getters for es6 and es2023 |
| packages/core/tests/syntax.test.ts | Refactored compareSemver helper function and updated test snapshots to reflect new browserslist expressions |
| packages/core/tests/config.test.ts | Updated test snapshot to match new browserslist format for es2015 |
| tests/integration/cli/build/build.test.ts | Updated snapshot to reflect var to const transpilation change |
| tests/integration/syntax/snapshots/index.test.ts.snap | Updated snapshot showing changes in transpilation output for default parameters and variable declarations |
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Timeless0911
approved these changes
Oct 23, 2025
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Summary
used a script to map SWC https://github.com/swc-project/swc/blob/main/crates/swc_ecma_preset_env/data/@babel/compat-data/data/plugins.json with https://github.com/swc-project/swc/blob/main/crates/swc_ecma_preset_env/src/lib.rs#L829-L847.
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